Light-emitting device package and light-emitting module including the same

• US 9,929,327 B2
• Filed: 11/18/2015
• Issued: 03/27/2018
• Est. Priority Date: 11/19/2014
• Status: Active Grant

• Current Assignee: Suzhou Lekin Semiconductor Company Limited
• Original Assignee: LG Innotek Company Limited (LG Corporation)
• Inventors: Joo, Yang Hyun, Lee, Chang Hyuck, Kang, Bo Ra, Kim, Sung Phil, Son, Chang Gyun
• Primary Examiner(s): Breval, Elmito
• Assistant Examiner(s): Cadima, Omar Rojas
• Application Number:
  US14/944,397
• Publication Number:
  US 20160138774A1
• Time in Patent Office: 860 Days
• Field of Search: 362 84, 362240, 362268
• CPC Class Codes: H01L 2224/48091 Arched
• CPC Class Codes: H01L 2224/8592 Applying permanent coating, e.g. protective coating
• CPC Class Codes: H01L 2924/00014 the subject-matter covered by the group, the symbol of which is combined with the symbol of this group, being disclosed without further technical details
• CPC Class Codes: H01L 2933/0083 Periodic patterns for optical field-shaping in or on the semiconductor body or semiconductor body package, e.g. photonic bandgap structures
• CPC Class Codes: H01L 2933/0091 Scattering means in or on the semiconductor body or semiconductor body package H01L33/22 takes precedence
• CPC Class Codes: H01L 33/44 characterised by the coatings, e.g. passivation layer or anti-reflective coating
• CPC Class Codes: H01L 33/50 Wavelength conversion elements
• CPC Class Codes: H01L 33/54 having a particular shape
• CPC Class Codes: H01L 33/58 Optical field-shaping elements
• CPC Class Codes: H01L 33/62 Arrangements for conducting electric current to or from the semiconductor body, e.g. lead-frames, wire-bonds or solder balls

Abstract

Embodiments provide a light-emitting device package including a light source, a lens disposed on the light source, and a diffuser located on at least one of the interior of the lens or a light emission surface of the lens, so as to diffuse light. The diffuser includes at least one of a light dispersing agent distributed in the interior of the lens, or at least one light diffusion structure located on at least one of the outside or the inside of the light emission surface of the lens. The light diffusion structure includes a rough surface formed on the light emission surface of the lens.

Claims

1. A light-emitting device package comprising:

a light source;

a lens disposed on the light source; and

a diffuser located on the interior of the lens and a light emission surface of the lens, so as to diffuse light,

wherein the diffuser includes;

a light dispersing agent disposed to be distributed in the interior of the lens; and

at least one light diffusion structure located on at least one of the outside or the inside of the light emission surface of the lens,

wherein the light diffusion structure includes a rough surface formed on the light emission surface of the lens,

wherein the light diffusion structure includes at least one hole and at least one rod located at the light emission surface of the lens, and

wherein the at least one hole includes a plurality of holes having different depths, and the at least one rod includes a plurality of rods having different heights.

2. The package according to claim 1, wherein the rough surface has a roughness within a range of 3 μ

m to 15 μ

m rms.

3. The package according to claim 1, wherein the hole and the rod are periodically arranged.

4. The package according to claim 1, wherein the hole and the rod are non-periodically arranged in a random manner.

5. The package according to claim 1, wherein the rod has at least one shape selected from among a semispherical shape, a prism shape, a conical shape, a truncated shape, a polyhedral shape, a bar shape, and a lattice shape, or combinations thereof.

6. The package according to claim 1, wherein the rod has a height of 10 μ

m.

7. The package according to claim 1, wherein the light diffusion structure is located on at least a portion of a side surface of the lens, the side surface being the light emission surface.

8. The package according to claim 1, wherein the light diffusion structure is integrated with the lens and is a portion of the lens.

9. The package according to claim 1, wherein the light diffusion structure is attached or applied to the lens.

10. The package according to claim 1, further comprising a fluorescent substance disposed between a lower surface of the lens and the light source.

11. The package according to claim 10, wherein the fluorescent substance includes:

a first fluorescent portion disposed between a first lower surface of the lens and an upper surface of the light source;

a second fluorescent portion extending from the first fluorescent portion, the second fluorescent portion being disposed between a second lower surface of the lens and a side surface of the light source; and

a third fluorescent portion extending from the second fluorescent portion, the third fluorescent portion being disposed under a third lower surface of the lens, and

wherein the lower surface of the lens includes the first, second, and third lower surfaces.

12. The package according to claim 11, wherein the third fluorescent portion is located so as to overlap the light diffusion structure in a vertical direction.

13. The package according to claim 10, wherein the fluorescent substance and the lens have the same width.

14. The package according to claim 1, wherein the lens has a width different from a height thereof.

15. The package according to claim 1, wherein the light source is located in a recess formed in the lens.

16. The package according to claim 1, further comprising:

first and second lead frames; and

an insulator disposed between the first and second lead frames, so as to electrically insulate the first and second lead frames from each other.

17. A light-emitting module comprising:

a module board;

a plurality of light sources arranged on the module board;

a plurality of lenses arranged respectively on the light sources; and

a diffuser located on the interior and a light emission surface of the respective lens, so as to diffuse light,

wherein the diffuser includes;

a light dispersing agent disposed to be distributed in the interior of the lens; and

at least one light diffusion structure located on at least one of the outside or the inside of the light emission surface of the lens,

wherein the light diffusion structure includes a rough surface formed on the light emission surface of the lens,

wherein the light diffusion structure includes at least one hole and at least one rod located at the light emission surface of the lens, and

wherein the at least one hole includes a plurality of holes having different depths, and the at least one rod includes a plurality of rods having different heights.